CBSE Questions for Class 10 Chemistry Periodic Classification Of Elements Quiz 4 - MCQExams.com

How does number of valence electrons vary on moving from left to right In the first period of a periodic table?
  • 0
  • 1
  • 2
  • 3
Which of the following elements is a metalloid?
  • Tin
  • Aluminium
  • Silicon
  • Zinc
If A, B and C are the three elements of Dobereiner's triad and atomic weights of A and B are 7 and 15 respectively, then the atomic weight of C is :
  • $$1$$
  • $$11$$
  • $$23$$
  • $$25$$
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
The number of valence electrons ___________ across a period and ________ down the group:
  • increases, remains same
  • decreases, remains same
  • remains same, increases
  • increase, decreases
The law used by Newlands to arrange elements is known as Newlands Law of Octaves .
  • True
  • False
Which of the following can be classified as Dobereiner's triads?
(a) P, As, Sb 
(b) Cu, Ag, Au
(c) S, Se, Te
  • a and b
  • b and c
  • a and c
  • all of the above
Which of the following has maximum non-metallic character?
  • F
  • Cl
  • Br
  • I
According to Mendleev's periodic law which properties of the elements are the periodic function of their atomic masses?
  • Physical properties
  • Chemical properties
  • Physical and chemical properties both
  • None of these
On moving from top to bottom in a group in the periodic table, valency:
  • increases
  • decreases
  • remains same
  • first increases then decreases
Which of the following pairs of elements does not follow the Law of Octaves?
  • $$Na, K$$
  • $$Ca, Sr$$
  • $$F, Cl$$
  • $$O, S$$
Which of the following is the correct match?
(a) Eka silicon - $$\text{Ge}$$
(b) Eka aluminum - $$\text{Ga}$$
(c) Eka manganese - $$\text{Tc}$$
(d) Eka boron - $$\text{Sc}$$
  • b, c
  • a, b, d
  • a, d
  • All of above
Which of the following pair of elements are expected to have similar properties according to Newland's law of octaves? 
  • $$Ne, Ar$$
  • $$C, N$$
  • $$Na, K$$
  • $$P, S$$
Which element has smallest atomic size?
  • Fluorine
  • Chlorine
  • Bromine
  • Iodine
Who was the first to classify the elements into metals and non-metals?
  • Meyer
  • Mendeleev
  • Lavoisier
  • None of the above
The anomalous pairs in Mendeleev's periodic table is/are_______.
  • Co, Ni
  • Te, I
  • Ar, K
  • All the above
Which of the following set of elements is written in order of their increasing metallic character?
  • $$Be< Mg< Ca$$
  • $$Na< Li <K$$
  • $$Mg <Al <Si$$
  • $$C <O< N$$
If three elements $$X, Y,$$ and $$Z$$ form a Dobereiner's triad and atomic weights of $$X$$ and $$Z$$ are $$9$$ and $$40$$ respectively, then the atomic weight of the element $$Y$$ is approximate:
  • 24.5
  • 49
  • 34.5
  • 29
The elements $$A$$ and $$B$$ obey Newland's law of octaves. How many elements are there between $$A$$ and $$B$$?
  • 7
  • 8
  • 5
  • 6
What type of oxide would Eka-aluminium form?
  • $$EO_3$$
  • $$E_3O_2$$
  • $$E_2O_3$$
  • $$EO$$
The element with the atomic number $$9$$ resembles with the element having the atomic number:
  • $$8$$
  • $$17$$
  • $$36$$
  • $$27$$
The element in between lithium and potassium according to Dobereiner's classification is:
  • Mg
  • Na
  • Ca
  • Rb
According to the Newlands' law of octaves, the properties of fluorine are similar to those of  ________ .
  • hydrogen
  • lithium
  • sodium
  • potassium
The Newland's law of octaves for the classification of elements was found to be applicable only up to the element ______________________.
  • Potassium
  • Calcium
  • Cobalt
  • Phosphorous
The valency of elements in the periodic table with respect to hydrogen:
  • increases regularly from $$1$$ to $$8$$
  • decreases regularly from $$1$$ to $$8$$
  • first increases from group I to group IV and then decreases
  • first decreases from group I to group IV and then increases
Which of the following elements has the maximum number of outermost electrons?
  • Na
  • Mg
  • Si
  • P
What is the valency of potassium with atomic number $$19$$?
  • $$0$$
  • $$1$$
  • $$2$$
  • $$3$$
The element placed with nickel in the table formed by Newlands was :
  • iron
  • cobalt
  • chromium
  • copper
Which element resembles cobalt and nickel but was placed in Newlands' table far away from those elements?
  • Sodium
  • Calcium
  • Iron
  • Chlorine
According to Mendeleev's periodic table, one element whose atomic mass is greater than that of nickel is placed before nickel. Name the element.
  • Copper
  • Iron
  • Zinc
  • Cobalt
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